What does 10w-40 engine oil mean?

1 Answers
OAlexander
07/29/25 3:35pm
Engine oil 10w40 refers to the viscosity grade of the oil being 10w40. Here are the specific explanations: 1. Engine oil 10w40 indicates that the oil's viscosity grade is 10w40. The number before the 'w' represents the cold start performance - the smaller the number, the easier it is to start the engine in cold weather. Common grades include 0W, 5w, 10w, and 15w. The number 40 indicates the oil's viscosity characteristics at high temperatures. Higher viscosity oils (with higher numbers) may be more suitable for high-speed driving or heavily loaded vehicles. 2. 10w40 oil has relatively high viscosity and better sealing performance, but it makes the engine consume more fuel. At idle, higher viscosity oil produces lower noise, while during driving, higher viscosity oil generates more noise. Lower viscosity oil has the characteristic of being more fuel-efficient.
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